Who killed Robin's parents?
Approved answer
The Tragic Fate of the Graysons
As the youngest member of the renowned acrobatic family known as the Flying Graysons, Grayson tragically witnesses the heinous act committed by mafia boss Tony Zucco, who murders his parents in an attempt to extort money from the circus that employed them. Following this devastating event, Bruce Wayne takes Grayson under his wing as his legal guardian and trains him to become his capable partner, Robin.